Fix state export (#3672) (#3673)

(cherry picked from commit 480a090)

Co-authored-by: Dev Ojha <[email protected]>

x/ibc-hooks/sdkmodule.go

@@ -121,10 +121,8 @@ func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, data json.
 	return []abci.ValidatorUpdate{}
 }
 
-// ExportGenesis returns the exported genesis state as raw bytes for the mint
-// module.
 func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage {
-	return json.RawMessage{}
+	return json.RawMessage([]byte("{}"))
 }
 
 // BeginBlock returns the begin blocker for the mint module.